Primary Aluminum Water Cooling Block 40 80 120 160mm for Liquid Water Cooler Heat Sink System Silver Use For PC Laptop CPU Features: Internal channel formed by extrusion flow Brazed parts as a complete unit Processed using vacuum brazing aluminum technology Surface treatment: silver oxidation Suitable for computer CPU water cooling, industrial driver inverters, laser head cooling, and industrial cooling control cabinets Specifications: Item Type: Water Cooling Block Material: Aluminum Alloy Color: Blue Size: 1#/2#/3#/4#/5# (Optional) 1#: 40x40x12mm / 1.57x1.57x0.47in 2#: 40x40x12mm / 1.57x1.57x0.47in (Upper water outlet) 3#: 40x80x12mm / 1.57x3.15x0.47in 4#: 40x120x12mm / 1.57x4.72x0.47in 5#: 40x160x12mm / 1.57x6.30x0.47in (approx.) Quantity: 1 Piece (other accessories shown in picture not included) Notes: 1. Conversion: 1cm = 10mm = 0.39inch 2. Please allow 0-1cm measurement deviation due to manual measuring. Ensure you are comfortable with this range before purchasing. 3. Due to monitor display differences, the actual color may vary slightly from the image. Thank you. Package Includes: 1 x Water Cooling CPU Block (No retail packaging)